Table 2 retrieves data from existing fields in Table 1. The system also creates additional fields in Table 2. Not all fields are transfered from Table 1 to Table 2. These tables may have millions of records so efficentcy is important.
I need to compare that the records are accurately populated in Table2 from Table1.
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Have you ever had to make fundamental changes to a table in Oracle, but haven't been able to get any downtime? I'm talking things like:
* Dropping columns
* Shrinking allocated space
* Removing chained blocks and restoring the PCTFREE
This post first appeared at Oracleinaction (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself).
I will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…
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